Make sandalwood paste. Sandalwood is known for its skin healing properties, and is easy to prepare at home. Just mix one tablespoon of sandalwood powder with a few drops of rosewater or milk to form a paste. Apply this paste to the affected area and leave it on for at least 30 minutes before rinsing. Repeat this process daily until your scars have vanished.
If you use hair sprays or gels, try to keep them away from your face, as they also can clog pores. If you have long hair that touches your face, be sure to wash it often enough to keep oil away. And if you have an after-school job that puts you in contact with oil — like in a fast-food restaurant or gas station, for example — be sure to wash your face well when you get home. It also can help to wash your face after you've been exercising.
It may take time, but discovering how to get rid of pimple scars isn’t as impossible as you think; solutions ranging from natural, DIY home remedies to professional-grade procedures are available at your fingertips. So what works best? In the end, only your unique skin can say, but we do have a few suggestions (hint: they don’t involve expensive fillers or lasers). If you want to learn how to get rid of acne marks effectively and affordably, keep reading and start saying sayonara to unsightly scars.
Ans: When the follicle or pore becomes clogged due to excess oil, bacteria and dead skin cells then the pores swell by causing a break in the follicle wall. If the rupture occurs near the skin’s surface then lesion will be minor and gets healed quickly. Then this infected material extends into the dermis and destroys the healthy skin tissue then it forms scars on the skin.
Acne is a common skin condition that plagues people of all ages. Blemishes always seem to appear the day before a special event, so it's a common desire to want to get rid of them overnight. While that's not always possible, what you can do is speed up the healing process by taking extra care of your skin and working to open the clogged pore so the blemish can fully heal.
Another study focused in on dairy. In 2005, an article in the Journal of the American Academy of Dermatology took on milk and milk products. By examining the diets of 47,355 women, researchers observed a significant connection between milk and dairy intake and breakouts. Some researchers believe this is caused by high levels of hormones found in our milk products. Much of the milk consumed is produced by pregnant cows, who pump out progesterone, IGF-1, and other compounds that are then passed into the milk. We may also be subject to Bovine Growth Hormone (BGH). These hormones can signal the oil glands to start producing more sebum, which can affect acne. Unfortunately, switching to organic milk doesn’t seem to make a difference, and neither do skim milk options. In fact, skim milk has been observed to worsen the skin, which researches have attributed to lower levels of estrogen and different processing activities. Milk is also known to contain a number of vitamins, some good and some not so beneficial to your skin. Research has shown a correlation between acne and vitamin A in milk. 
Hormones are ruthless, and all the topical treatments in the world won't make a difference if yours are seriously out of whack. In that case, you need to fix things internally first. "Medications that manipulate hormonal levels, such as oral contraceptives and spironolactone, are helpful in curbing hormonal chin and lower face outbreaks," Dr. Tzu says. Ask your derm about what might work for you.
Avoid picking at spots and scars. Though it may be tempting, picking at your scars interrupts the process by which your skin naturally heals and can worsen their appearance. Picking at existing pimples, meanwhile, can cause your skin to scar in the first place, as bacteria from your hands may be transferred onto your face, causing it to become inflamed and infected. Therefore, picking should be avoided at all costs.

Topical (external) applications: Antibacterial cleansers come in the form of gels, creams, and lotions that are applied to the affected area. The active ingredients that kill surface bacteria include benzoyl peroxide, sulfur, and resorcinol. Some brands promoted on the Internet and cable TV (such as ProActiv) are much more costly than identical and sometimes more potent products one can buy in the drugstore.
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